Influence of porosity in a packed-bed tubular reactor on biodiesel production from soybean oil and supercritical ethanol: an experimental and phenomenological investigation
In the present study, the transesterification of soybean oil with ethanol under supercritical conditions was investigated using a packed-bed tubular reactor. The experiments were performed with an oil/alcohol molar ratio of 1:40, a pressure of 15 MPa, and different conditions of temperature (573−6...
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| Principais autores: | , , , , , , , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
American Chemical Society
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| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/45109 |
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| Resumo: | In the present study, the transesterification of soybean oil with ethanol under supercritical conditions was
investigated using a packed-bed tubular reactor. The experiments were performed with an oil/alcohol molar ratio of 1:40, a
pressure of 15 MPa, and different conditions of temperature (573−673 K), flow rate (0.5−1.0 mL/min), and bed porosity
(0.32−1.0). A phenomenological model was developed to describe and analyze the results. The highest ester yield (98.99%)
was obtained for the lower bed porosity (0.32), under 673 K and 0.5 mL/min with a residence time of 5.44 min. The kinetic
and dispersion coefficients were estimated using the particle swarm optimization algorithm, and the model fitted the
experimental data with an R2 coefficient of 0.97. The proposed kinetic model followed the behavior of the Arrhenius equations.
Low values of dispersion were observed under conditions of lower flow rate and porosity. An analysis of the model allowed us to
verify that the increase of the ester yield produced occurs at small values of the Reynolds number and high Peclet numbers |
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